Extract hardcoded error strings into a single place and replace them with enum.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 123506fa623592f72f03919f7949818b56f0d81a..b7828b81ab6b2b83d107955815c1d8f4ad3f249e 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -3153,7 +3153,7 @@ Handle<Code> LoadStubCompiler::CompileLoadGlobal(
     __ j(equal, &miss);
   } else if (FLAG_debug_code) {
     __ cmp(eax, factory()->the_hole_value());
-    __ Check(not_equal, "DontDelete cells can't contain the hole");
+    __ Check(not_equal, kDontDeleteCellsCannotContainTheHole);
   }
 
   HandlerFrontendFooter(name, &success, &miss);